MacKenzie, 29, joined City on loan from Blackpool until the end of the season late on Deadline Day this Monday evening.
The imposing Scottish centre half has recent experience of playing in the Championship and League 1 but has yet to feature for the Seasiders this campaign after suffering with an Achilles injury earlier in the season.
With MacKenzie now completely fit, however, the defender is eager to make up for lost time with the Bantams.
Starting with Saturday's trip to Port Vale, City have at least 13 matches to play over the next 43 days - plenty of opportunity then for MacKenzie get back into the action.
MacKenzie said: "I was injured in pre-season and I then got misdiagnosed originally which cost me two months.
"I have been training well for the last month or so now and I just need some games to show people what I can do. This is a great opportunity for me.
"I've seen that we have a lot of games coming up. I don't think I will be involved in them all but it is still good that there are a lot of matches coming up for us.
"The manager has spoken to me about the matches we have. Having been out for so long, he (Phil Parkinson) might not put me in every game but I will hopefully play in as many matches as possible.
"I didn't heard anything really about this deal until around 5:30pm last (Monday) evening but I was interested straight away.
"I spoke to the manager in the evening as the deal was getting done and he sold the club to me, not that he needed to sell it much.
"The club is clearly doing well this year and receiving a lot of publicity recently with the cup run.
"I was sure this would be a good place for me to come."
Following Saturday's trip to Vale Park, the Bantams entertain one of MacKenzie's former clubs, Milton Keynes Dons, next Monday (9 February 2015) in front of the Sky Sports cameras at the Coral Windows Stadium:
MacKenzie, who will wear squad number 15, said: "The two full seasons I played at MK Dons, we got into the Play-Offs both times.
"I don't know if I will feature in the (MK Dons) game yet but I quickly had messages from old friends from MK Dons when I signed here for Bradford.
"The texts were flying about with a bit of banter but it is all the same in football.
"MK Dons are clearly doing well this season but we seem to have a good bunch of lads here and I'm sure they will be up for it. It should be a good game."
Given that Blackpool are already out of this season's F.A Cup, MacKenzie will be eligible for City's F.A Cup Fifth Round tie against either Sunderland or Fulham at the Coral Windows Stadium a week on Sunday (15 February 2015).
MacKenzie added: "When that possibility gets mention, you can't help but pay attention.
"Bradford did amazingly down at Chelsea and that sort of thing does draw your attention to it.
"It would be nice to play my part in it (F.A Cup) if I can but I know that the league is important to us as well.
"I have some good experience of playing at this (League 1) level and it is a good division.
"There are a lot of big teams and good players in this division.
"I know that this is the bread and butter for this club - to try and get up the league.
"There are a lot of games left and places in the Play-Offs to play for.
"The cup is a nice bonus and it gives everyone a lift but the main focus has to be to look upwards in the league."